The Hammers are now seven points away from safety as they sit inside the bottom three.
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Green said on Sky Sports: "Ten games without a win you're wondering, where is the answer now?
"Where do West Ham go now? Where does Nuno go from here? You can't see things continuing much longer with the results like this.
"They need at least 30 points to have any chance of staying up and they're not going to get close at this rate."